Heat pump dryer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat pump dryers are energy inefficient and have high operating costs due to the use of high-power heating elements, and they either fail to retain the smell of objects being dried or are not suitable for certain types of drying due to the type of heat exchange mechanism used.
Innovation Solution
A heat pump dryer with an energy-efficient heat exchanger that allows for efficient heat exchange between refrigerant and air, using a four-way reversing valve and two heat exchangers positioned in separate air channels to absorb and release heat, allowing for continuous operation and effective moisture removal without additional energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional high-power heating elements are used in closed-cycle heat pump dryers, then the smell of objects can be retained, but operating costs increase significantly
Solution Approach 1:
The patent combines the evaporator and condenser into a single integrated heat exchanger unit, allowing refrigerant to perform sequential heat exchange operations within one compact structure. This eliminates the need for separate high-power heating elements while maintaining closed-cycle operation that preserves object smell, thereby reducing operating costs.
Solution Approach 2:
The refrigerant circulation path is nested within the heat exchanger structure, where the evaporator and condenser sections are arranged in a nested configuration. This allows the refrigerant to efficiently traverse both heat exchange functions within a compact volume, eliminating external high-power heating elements and reducing energy consumption while maintaining smell retention.
2Ease of manufacture
If evaporator and condenser are separately positioned in heat pipe heat exchanger, then heat exchange function is provided, but refrigerant must travel through considerable distance affecting efficiency
Solution Approach 1:
The patent merges the evaporator and condenser into a single integrated heat exchanger assembly where both functions are performed in close proximity. The refrigerant flows sequentially through the evaporator section and then the condenser section within the same unit, minimizing travel distance and improving thermal efficiency while maintaining effective heat exchange functionality.
Solution Approach 2:
The heat exchanger is designed with a compact three-dimensional arrangement where the evaporator and condenser sections are positioned adjacent to each other in space. This spatial optimization reduces the refrigerant path length from a linear considerable distance to a compact sequential flow path, improving efficiency without compromising heat exchange capability.
3Use of energy by moving object
If opened-cycle heat pump dryers are used, then energy efficiency is improved, but smell of objects cannot be retained
Solution Approach 1:
The patent designs a universal heat pump dryer system that can operate in multiple modes: closed-cycle mode for smell-sensitive applications and opened-cycle mode for energy-efficient operation when smell retention is not required. The same heat exchanger assembly serves both operational requirements, providing versatility in function while maintaining energy efficiency characteristics.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables efficient temperature control and continuous drying operations on an industrial scale by effectively absorbing and releasing heat, reducing energy consumption and maintaining a dry environment while preserving the smell of objects being dried.
Implementation Method 1
refrigerant circulating in the first portion is arranged to absorb heat from the air so as to become gaseous state
Implementation Method 2
the refrigerant is arranged to release heat to the air and return to liquid state
Implementation Method 3
energy efficient heat exchanger which is capable of providing heat exchange between refrigerant and air
Data Source
AI summary
A heat pump dryer includes a main casing having an air inlet channel and an air outlet channel, a compressor, a first heat exchanger positioned in the air inlet channel, a second heat exchanger positioned in the air outlet channel, a fan provided in the air inlet channel, and an energy efficient heat exchanger. The energy efficient heat exchanger has a first portion partially exposed to the air inlet channel, and a second portion partially exposed to the air outlet channel. Air is arranged to enter the air inlet channel to sequentially perform heat exchange with the first portion of the energy efficient heat exchanger and the first heat exchanger. Air passing through the air inlet channel is arranged to enter the air outlet channel to sequentially perform heat exchange with the second portion of the energy efficient heat exchanger and the second heat exchanger.